Pushing multiphoton resonant ionization of the argon atom to the low-intensity regime
Pushing multiphoton resonant ionization of the argon atom to the low-intensity regime
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DOI：
10.1103/physreva.106.023114
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发表时间：
2022-08
影响因子：
2.9
通讯作者：
Xu Yu;Na Wang;J. Lei;J. Shao;T. Morishita;Song-Feng Zhao;B. Najjari;Xinwen Ma;Shaofeng Zhang
中科院分区：
文献类型：
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作者：
Xu Yu;Na Wang;J. Lei;J. Shao;T. Morishita;Song-Feng Zhao;B. Najjari;Xinwen Ma;Shaofeng Zhang
研究了 800 nm 30-fs 线偏振激光场对氩原子的共振增强多光子电离过程，强度范围为 1.1 至 1.1。实验光电子能谱的强度与时间相关的薛定谔方程（TDSE）计算非常一致，其中清楚地识别了源自修饰耦合跃迁的双结构。在较低强度下，观察到通过该状态的共振电离过程，然而，来自阈值电离之上零级的光电子角分布中的预期峰值（射流）已经完全消失。这种行为归因于光电子的不同部分波（即 和 状态）的相干贡献中的相消干涉现象，并且已在我们的 TDSE 计算中得到证实。
Resonance-enhanced multiphoton ionization process of the argon atom by an 800-nm 30-fs linearly polarized laser field is investigated at intensities range from 1.1 to. Atintensity the experimental photoelectron energy spectrum is in a good agreement with the time-dependent Schrödinger equation (TDSE) calculation where the double structure originating from dressedcoupled transition is clearly identified. At lower intensity of, the resonant ionization process via thestate is observed, however, the expected peak (jet) atin the photoelectron angular distribution from the zeroth order above threshold ionization, has vanished completely. Such behavior is attributed to the destructive interference phenomenon in the coherent contributions of different partial waves of the photoelectron, namely,andstates, and has been confirmed in our TDSE calculations.